The 3D Secure authentication is an additional fraud prevention scheme that is available to all companies using the Sage Pay system to process transactions.
It allows a consumer to prove they are the cardholder to the card issuer, typically by entering a one time password, or via biometrics (a facial or fingerprint scan etc.) or via the card issuers own risk based authentication system. If 3D Secure authentication is successful, you will have fraud liability protection for that transaction as this liability is now passed back to the card issuer.
Want to know more?
If you want to know more about 3d Secure have a look at our what is 3D Secure article.